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RISS 인기검색어
- 검색키워드
- 저자 : Shaobo Zheng (검색결과 3 건)
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Experimental Study on a New Connection Method of Latticed Shell Joint
Liang Zheng,Xinrong Qu,Hong Guo,Shaobo Geng 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9
In this research, the axial and eccentric pressure tests and finite element analysis (FEA) of a latticed shell joint with different parameters were carried out. The experimental and FEA results showed that the annular plate yielded first, followed by steel tube 1, and then steel tube 2 under the axial pressure and eccentric pressure. The ultimate bearing capacities of connection method II under axial pressure and eccentric pressure were 15% and 11% higher than that of connection method I, respectively. The wall thickness of steel tube 2 was reduced by 2 mm, and the ultimate bearing capacities under axial pressure and eccentric pressure is reduced by 15% and 11%, respectively. The wall thickness of steel tube 1 was reduced by 2 mm, and the ultimate bearing capacities under axial pressure and eccentric pressure is reduced by 6% and 9%, respectively. With the decrease of the concrete thickness, the ultimate bearing capacity under axial pressure and eccentric pressure reduced by 18% and 17%, respectively. The ultimate bearing capacity analysis showed that the height of the concrete and the thickness of steel tube 2 had a greater effect on the ultimate bearing capacity than the thickness of steel tube 1.
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Mechanism of MnS Precipitation on Al2O3–SiO2 Inclusions in Non‑oriented Silicon Steel
Fangjie Li,Huigai Li,Di Huang,Shaobo Zheng,Jinglin You 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6
This study investigates the mechanism of MnS precipitation on Al2O3–SiO2 inclusions during the solidification of nonorientedsilicon steel, especially the influence of the phase structures and sizes of the oxides on the MnS precipitation, byscanning electron microscopy and transmission electron microscopy coupled with energy dispersive spectrometry. Theinvestigation results show that MnS tends to nucleate on submicron-sized Al2O3–SiO2 inclusions formed by interdendriticsegregation and that it covers the oxides completely. In addition, MnS can precipitate on micron-sized oxides and its precipitationbehavior is governed by the phase structure of the oxides. The MnS embryo formed in a MnO-containing oxidecan act as a substrate for MnS precipitation, thus permitting further growth via diffusion of solute atoms from the matrix. MnS also precipitates in a MnO-free oxide by the heterogeneous nucleation mechanism. Furthermore, MnS is less proneto precipitation in the Al2O3-rich regions of the Al2O3–SiO2 inclusions; this can be explained by the high lattice disregistrybetween MnS and Al2O3.
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Yuan Wu,Fangjie Li,Ting Wang,Dan Zhao,Hefei Huang,Huigai Li,Shaobo Zheng 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
The factor to deduce grain growth of non-oriented electrical steel sheet during heat treatment was researched in thispaper. Scanning electron microscope equipped with electron backscatter diffraction (EBSD), X-ray diffractionand transmission electron microscope were used to characterize the microstructure, dislocation density and precipitate,respectively. The EBSD results indicated that the grain size increased from 18.7 μm to 56 μm after heattreatment. Meanwhile, the characterization of grain size distribution, dislocation density and precipitates revealedthat the dissolution of Cu2S precipitates, which act as inhibitor, may lead to the grain growth. In addition, the pinningforce of grain boundary and the driving force of grain growth were calculated. Based on experiments resultsand theoretical calculations, the Cu2S precipitates with diameter of less than 39 nm and volume fraction of 1.74 ×10-4would be sufficient to inhibit the ferrite grain growth. Heat treatment provides an efficient way to prompt thegrain growth.
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